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y in (-oo:+oo)
cos(32) = y/18 // - y/18
cos(32)-(y/18) = 0
cos(32)-1/18*y = 0 // - cos(32)
-1/18*y = -cos(32) // : -1/18
y = -cos(32)/(-1/18)
y = 18*cos(32)
y = 18*cos(32)
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